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Grade 40Cr
Corresponding Standard GB /T 17107-1997
Structural Steel Grades And Mechanical Property For Forgings
Classification Alloy Steel
40Cr Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.37 0.17 0.5 - - 0.8 - -
Maximum Value 0.44 0.37 0.8 0.035 0.035 1.1 0.3 0.3
• High-quality steel——P≤0.035；S≤0.035；Cu≤0.3；Cr≤0.3；Ni≤0.3
• Extra-quality steel （Suffix A）——P≤0.025；S≤0.025；Cu≤0.25；Cr≤0.3；Ni≤0.3
• Special High-Quality Steel (Suffix E)——P≤0.025；S≤0.015；Cu≤0.25；Cr≤0.3；Ni≤0.3
40Cr Mechanical Properties
diameter or thickness
d
mm		 Mark
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
d≤100 Sample Direction: Longitudinal Tempering ≥735 ≥540 ≥15 ≥45 241~286 ≥39
100＜d≤300 Sample Direction: Longitudinal Tempering ≥685 ≥490 ≥14 ≥45 241~286 ≥31
300＜d≤500 Sample Direction: Longitudinal Tempering ≥685 ≥440 ≥10 ≥35 229~269 ≥23
500＜d≤800 Sample Direction: Longitudinal Tempering ≥590 ≥345 ≥8 ≥30 217~255 ≥16
• The forgings must be inspected for mechanical properties after performance heat treatment and before any surface treatment.
• After the samples are removed, no heat treatments that affect the mechanical properties or any processing that influences the test results shall be conducted.
• Mechanical property testing primarily evaluates the material\'s tensile strength, impact resistance, and hardness. When conducting tensile, impact, and hardness tests simultaneously, the hardness value is for reference only. Alternatively, one may choose to perform only one of the tensile, impact, or hardness tests.
Approximate Comparison Table Structural Alloy Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS14 BS EN/BS
40Cr A20402 SCr440 SCr440
SCr440H 		SCr440 5140 G51400 41Cr4 41Cr4 1.7035 42C4 41Cr4 1.7035 40Х 2245 530A40
530M40
40Cr Corresponding Standards(Same grade name, different standards)
1 GB
40Cr
2 GB /T 3077-1999
40Cr A20402
3 GB /T 17107-1997
40Cr
4 GB /T 3077-2015
40Cr A20402
5 Q/BQB 517-2018
40Cr
6 GB /T 3078-2019
40Cr
7 Q/BQB 135-2009
40Cr
8 JB /T 6396-2006
40Cr
9 Q/ASB 234-2018
40Cr
10 JB /T 6908-2020
40Cr A20402
11 GB /T 37601-2019
40Cr

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!